Method of making container closures



Feb- 15, 1938. u. M. HoTHERsALL 2,108,064

METHOD 0F MAKING vCONTAINER CLOSURES Filed Jun'e. 29. 1954 5Sheets-Sheet 1 ATTORNYS ulb.A 15, 1938. J. M. HoTHEReALL 2'108064 METHODOF MAKING CONTAINER CLOSURES Fild June 29. 1954 5 Sheets-Sheet 2 97 Y f7i 44 INVENTOR i 7/ L 4a 47 Y Y, azz/ Feb. l5, 1938o J. M. HoTHERsALL l2,103,064

METHOD OF MAKING' CONTAINER CLOSURES i Filed June 29. `1954 5sheets-sheet :s

Feb.. l5, 1938; J. M. HoTHERsAL| 3,108,064

' METHoD'ol-MAKIN'G GOTA'INER cLosUREs l Filed June 29. 1934'75,S-heltsishetx4- B 7l i? I .83 I

nal

Y C. ZZ 7;

,. /33 .I I l* gli @76? 95' 24 77 @Nw- 1 wijs/gi 2V. ATroRNEYS PatentedlFel. 15.1938 I uNiTEo-STATES- PATENT. oFFics Y Marilou" or 'MAKING'CONTAINER M cnosoans Jaim mnothemu; Brooklyn, N. Y., signor a vAmericanCan Company, New York,

corporation ofv New Jersey N. Y., a

Application Jillie 29, 1934,`Seri'l o. 733.147

The present invention relates to a method of producing containerclosures and is particularly directed to producing a multipart'closurefrom a one piece blank including a'cover anda tearable sealing bandwhich hasno projecting parts outside wall by means of which the. sealingband is severed and the cover'is released from sealing position whenthecontainer is opened.

In some instances a container -having a tearm ing tongue which extendsoutside of the container side walls has been found to be unsatis factoryand is liable to be inadvertently engaged and the container prematurelylopened and itis an object, therefore, of the present invention toprovide in a series of .method steps a closure of this general type butone having a tearing tongue fully confined within the cover` and with noprojecting parts outside of the container walls.

Numerous other objects and advantages of the invention will be apparentas it is better under- 'stood from the following descriptiomwhich, takenin connection with the accompanying drawings, discloses a preferredembodiment thereof.

Referring to the drawings:

Fig. 1 is a perspective view of one form of container sealed by aclosure made and applied according to the'method steps of the presentinvention;

Fig. 2v 'isv an enlarged fragmentary sectional detail showing" thecontainer and closure in par and in fully sealed position;

Fig. 3 isea perspective view of a blank fro which the multipart closureis formed;

Fig. 4 is a fragmentary top plan view of one form of apparatus forcarrying` out the method steps of the present invention;

Fig. 8 is a similar view showing a further step in the production oftheclosure parts as produced in the die unitr shown at the left 'in Fig. 6;Fig. 9 is a fragmentary sectional view of the cutting diennitillustratedat the left of Fig. 6

showing the parts in a diiferent position;

Figs. 10 and 11 are fragmentary sectional views` of the assembling dieunit illustrated 4at the right "s claims. l(ci. 11s- 121) of Fig. 6, andshowing .different positions of its y operating parts;

Fig. 12 is a perspective view of the cup member afterA it has been cutand reshaped on the die "unit of Fig. 9;

Fig. 13 is a similar view showing the relation of the severed parts atan intermediate step during the assembling operation as performed in thedie unit of Fig. 10;

Fig. 14 is a similar View showing the assembled parts after 'operationof the die unit illustrated in w Fig. 11;

Fig. 15 is a fragmentary sectional detail of the assembled parts on anenlarged scale and further showing the application of aV sealingcompound thereto; and

Fig. 16 is a-fragmentary sectional view of the completely sealed`container showing parts of a chuck and a seaming roller in cooperativerelation as they operate to effect such sealing.

In the method steps of the present invention a pre-cut flat blank ofsheet material a (Fig. 3)

preferably circular in shape and having a '1ater' ally projectingtearing tongue is positioned over a pocket of anintermittently revolvingdial of a punch' press or the like (Fig. 4). This dial carries the blankand its subsequently altered forms through a series of stations wherevarious operations are. performed on it.

The blank is first presented to a forming station A where it is drawninto a stepped cup member b (Fig. 7) having its tearing tongueprojectving outwardly and substantially at right angles to its exteriorside wall.

This cup member, within the pocket of the dial, is carried to a cuttingstation B. Here a cutting element descends from above and rst cutsthrough the stepped wall section of the cup producing two parts afterwhich one of them is at once partly reshaped. The combined finaloperations performed at this station divide the cup member into anouterv ring c having a vertical Wall section, and an inner formedcover'part d having an outwardly bent flange (Fig. 12);

This action also bends'the tearing tongue, at'

tached to the ring c, into vertical position.l

With parts c and d still within the pocket, the dial now carries them toan'assembling station "C, At the assembling' station the raised panelcover! and the two temporarily united now form Further` actionbringsthese a multipart closure a. It will be observed by reference toFig. 14 that the tearing tongue extends in and down, where it conformsto the shape of the channel, and then extends horizontally against thetop of the cover wall being wholly confined within the boundaries of theclosure. The closure a is now ejected from`the dial pocket of the punchpress.

1f a hermetic seal is desired yany suitable lining or packing materialmay be used in the channel of the closure. For the lining step theclosure is inverted and passed into a station D (Fig. 15) of a liningmachine or the like at which a sealing compound or its equivalent isdeposited in the U-shaped channel.

The closure with or without a packing material is now applied to the topof a container and may then be passed into a closing station E (Fig. 16)of a seaming machine or the like. Here the exterior wall section of thesealing band e is bent around the top edge of the mouth of the containerwhere it holds the cover in container closing position.

To illustrate a preferred use for a multipart closure provided by themethod steps ofthe invention there is illustrated in the drawingsaconventional type of container (having aycylindrical or other form oftubular body 2l (Fig. 1) suitably connected with a closed bottom 22. The

upper part of the body wall is necked-in at 22 to provide a smaller topendy 24 (see also Fig. 2) which terminates in an outer curled edge 25.It is this open end of the container that is closed by the applicationof closure parts formed from the one piece blank a.` (Fig. 3) as willnow be fully described.

The blank, of suitable size and dimension, is cut or blanked from sheetmaterial, this being a well known step in the manufacture of can endsand the like. This blank comprises a flat cirg cular disc 26 having atongue extension 21' which is perforated at 28 and having a tearing slit29 at the juncture of its peripheryv and one s ide of the tongueextension 21.

,Such a blank is subjected to a series of operations as has already beensuggested which are carried out bydie mechanisms the principal parts ofwhich are shown in the drawings. mechanisms are in part embodied in astationary bolster plate 35 (Figs. 5 and 6) which may rest on the frameor bed of a suitable punch press or the like. A dial 36 (see also Fig.4) has movement over the top of this bolster plate and is keyed to acentral vertical shaft 31 which is journaled in the frame of the press.'Ihis shaft is connected to any suitable source of power for rotatingthe dial in an' intermittent step by step movement.

'I'he dial 36 is provided with a series of spaced cylindrical openings38 each of which -is lined with a tight tting bushing. Vlllach bushinghas two inside diameters, the upper part 4I being the larger and itswall curving inwardly te join with an annular shoulder 42 of the smallerdiameter. A blank holding ring 44 is slidably disposed within eachbushingand during movement of the dial 26 its top surface is ilush withthe top of the dial. 4'I'he wall of theopening 4i of each bushing 39 iscut back in one place into over the vertical notch.

a vertical notch 4l (Fig. 4) and when a blank a is rst placed into thedial it is centered over the holding ring 44 with its tongue 21 alignedDie first step which will now be explained with the blank at the drawingstation A. Here These it is subjected to a drawing operation by means ofa punch and die mechanism, the principal parts of which are illustratedin Fig. 5. Thev ring 44 which holds the blank now being considered isdirectly over die elements disposed.

in an opening 44 formed in the bolster plate. In this position the ringis directly over sliding pins 41 which are located in vertical bores 4lformed in the bolster plate 3l.

A punch element 6| is directly above the holdling ring. The punchelement carries a pressure ring 52 which normally projects below theface of the punch. These parts il, 52 are shouldered for cooperation inlimiting the relative movement between'thern. Compression springs 54 arelocated in spring pockets 55 which are formed in the upper part of thepressure ring and the ring move down into the bushing opening 4|. Theholding ring 44 moves down lntothe die opening 46. A shoulder 58 whichconstitutes the bottom wall of the opening 4 6 limits this movement ofthe rings and the blank.

Continued downward travel of the punch is thereafter taken up in thepressure ring by compression of the springs 54. The face of the punchengages the unsupported central part oi the blank and presses it into astationary die ring ll which is secured in s. recess 42 formed in the bolster plate.

The punch and die ring faces are correspondingly shaped to cooperate indrawing the' blankinto its `ilrst drawn form, that of the stepped cupmember b best shown in Fig. '1. The central lower face of the punch isrecessedjat 43 (Fig. 5) and a knockout pad 64 is seated in the recess inthe lower face of the pad. during the drawing action now beingconsidered, providing a conheld stationary with the ring. At thecompletion of the drawing stroke when the cup member b is fully formed,the latter is neidjbetween the punch 5| and pad I4 from above and thering and plunger 1| from below. This is the position of Fig. 5.

425 the holding ring while both blank and pressure Considering the'diiferent parts of the newly formed cup member b it' will be observedthatfit is oi' stepped construction having concentric w' 12, 13 joinedby a right angled connecting 14. The smaller wall 13 merges into anangular section 15 inside of which is a center panel 14. The variousparts' will be again referred to in. tbedescription that jfollows.

As .the punch ll returns on its upward stroke the cup-member b remainsin the holding fing 44 and afterthe springs 64 have expanded'and thepressure ring i2v has been pickedup withthe punch, the holding ring 44withl its member b follows up and returns into its pisos in the dial u36. At the same time the plunger 1| moves up and these combined actions'strip the cup b from the die ring 6|. The knockout pad 64 thereuponoperates (moves down from its recesswithin the punch and frees punch andcup b leaving l,the latter in its pocket within the holding ring 44.

The dial is now rotated in a. second step of movement and conveys thecup member b in its holding ring to the station B where the cup memberis positioned over an opening in a die part of "f a punch and diemechanism shown at the left in Fig. 6.

The punch mechanism comprises a punch element 11 which has an annularcut edge 18 land is located directly above the die mechanism.'

The punch element 11 and .plate 19 also carry a knockout pad 84 which isthreadedly secured to the lower end of a stem 85 which extends upthrough the punch element, the pad being seated in the recess 8|. 4

Thedie mechanism comprises a die ring 86 which is seated in an annularrecess 81 formed in the bolster plate 35 and this ring holdsfan innerring 88 in place within the recess.

A draw ring 99 is slidably located inside of the inner ring 88 andisformed with 4a projecting lower ridge 9| which engages against theAbottom edge of the inner ring when the drawl ring is in its raisedposition (Fig. 6) the inner 'ring thus forming a limit stop for the drawring. The bolster plate is counter-bored at 92 and provides a recess forthe draw ring when depressed.

Draw ring 89 is supported on 'the upper ends of spring or rubber heldpins 93 which slide in vertical bores 94 formed in the bolster plate,this being a usual construction for dies of this na.- ture. A stationaryanvil 95 is located inside of the draw ring and is rigidly supported at96 in the bolster plate 35. v

With the punch and die parts inthe position shown on the left of Fig. 6and the cup member b resting in its holding ring 44 cutting or severingand further forming operations take place as the punch mechanism movesdown and vcooperates with the die mechanism.

The pilot `plate 19 first' enters the cup member b, its lowerl surfaceengaging the angular face of the cup and the bottom of the cut edge 18coming against the wall 14. The pilot plate is thus centered inside thewall 13 and the punch element is inside of the wall 12.

The cup member accordingly moves down withv brought down against the diering 86 and its` center wall engages the stationary anvil 95. Thisconstitutes a second step movement in the descent of `the cup member atwhich time. its upper edge snaps under the notched -ends of holdingfingers 91 which are carried in the holding ring 44.

- Each iingerv 91 is slidably mounted iny a horizontal slideway 98 cutthrough the wall of the holding lring. A vvertically disposed lever 99is provided for each finger, its lower end'loosely engaging the nger ina ball and socket joint .10|` Each lever has slight rocking movement ina slot |02 cut'in the holding ring and this slot merges at its bottomend with the finger slideway 98.

The lever 99 is also' pivotally mounted on a pin |03 .held in the ringand a spring |04 which is housed in a suitablev horizontal pocketpresses out on the upper end of the lever normally holding the nger in'the'position shown in Fig. 6, the upper and outer end of the leverstriking against the inside wall of the bushing 39. The springs |04y'ield when the upper part of the cup member b snaps past the notchednger ends as just described.

Immediately following this stage in the descent of the punch parts thecutting and severing action takes' place, the cup member b being dividedinto two parts as the cut edge`18 of the punchv element 11 passesthrough the cup wall 14 and cooperates with an inner cutting surface |05of the die ring 86.V 'Ihe ring c (Fig. 12) is one j of the partsresulting from the severing action and is not furtheraltered at thisstationB. An

uncompleted cover part d is the other part rethe punch plate 191pressingdown on the cup' wall 15 further depresses the draw ring 89; The innerpartof the wall 15 thereupon is drawn into a vertical wall |06 (Fig. 12)as the metal pulls over between the parts 19, 89 and this draws thelower part of the cup wall 13v into a new outewall |01, this reshapingtaking place y withinethe punch recess 8|. l 'l fThe nal shaping actionin this series of movements at station B` on the cover d is completed asthepunch mechanism reaches the bottom of its stroke-the parts then beingin the position of l'ig` 9. What was the horizontal wall 14 has now beenaltered into a flange |08 (Fig. 12) as this section -of the closuremember is drawn into an inclined position by being pulled against theupper inner corner of the inner ring B8. 'I'he old panel wall 16 merginginto the right angled wallal 01 now constitutes a central panel wall|09. This completes the operations at station B. The punch onits returnstroke carries with it the formed cover part d. At thesame time thengers 91 hold the vring c in place adjacent to and inside of the cuttingsurface |05. The knockout device now comes into operation the pad 84being lowered to eject the cover part d from the punch and leave itwithin the holding ring pocket where it is just inside of and adjacentto the ring c (Fig. 8).

The dial is now rotated through a third step movement which conveys themembers c and d in their holding ring 44 to the station C where they"are positioned in alignment with a pimch and die mechanism shown at theright of Eig. 6. The holding'ring is Vdirectly over die elementsdisposed in an opening |2| formed in the bolster Dlate 35. directly oversliding support pins |22 which are In this position the lholding ringis- .located in vertical bores |23 formed in the bolster plate.

The punch mechanism comprises a punch element |25 which is locateddirectly above the die mechanism and which carries an annular outerpressure ring |26 which normally projects below the. face of the punch.These parts are 'shouldered for cooperation in limiting relativevmovementl .between them. Compression springs |29 are located on top ofthe outer pressure ring andl extend vup into spring pockets |3| formedin the bottom of a recessed plate ,|32

which fits over the top of the punch and around its shank, being heldin. position by screws |33. The punch element |25 also carries anannular inner pressure-ring |34 which is disposed in a central bore |35formed in the bottom of the4 with a recess |39 which houses a knockoutpad |4| threadedly secured to the lower end of .a

.stem |42 which extends, up through the 'pad and the punch element.

The die mechanism comprises a draw ring |45 which is centrally confinedwithin the opening |2| by a die ring |46. 'I'hese two rings areshouldered for cooperation in limiting 'relative movement between them.The bottom of the ,die ring is formed with an annular base |41 which issecured in an annular groove |43 formed in the bolster plate 35 at thebottom of the opening|2|. The ring base is provided with clearance holesfor the support pins |22. The draw ring is also supported on yieldablepins |43 located in vertical ybores formed in the bolster plate.

An expanding die unit is located inside of the draw ring |45. The unitcomprises a plurality of die sectors |53 which are grouped in a circlearound the upper end of a vertical earn plug |54, andare yieldingly heldtogether by a pair of encircling coiled springs |53 which are located inannular spaced grooves |51 cut in the exterior surfaces ofthe sectors.'

The cam plug is rigidly held inV a drive 'fit opening |53 in the bolsterplate 35. The sectors rest on top of a ring plate v|53 which issupported y on yieldable pins |6| located in vertical bores.

|02 formed in the bolster plate.

The top of each sector |53 is enlargedin cross section and extends outin an overhanging arcuated projection |53 having a sloping bottom wall|34. 'I'he inner surface of each sector in section ls formed with camsteps having alternate vertical and sloping wedge surfaces whichcorrespond with like vertical and sloping surfaces formed on the upperend of the cam plug |54. This cam construction is common in expandingdies of this type.

With the punch and die parts in the position shown on the right of Fig.6, with the ring c held in the holding ring 44 and the cover ,part dsupported on theA draw ring |45 further bending operations take placeonboth closure parts c, d as the punch mechanism moves down and co-`operates th the die mechanism. V

The ou r pressure ring |25 ilrst engages the top of the holding ring.44and moves it down into the opening |2|. The .ring c still heldl fromabove by the holding fingers 91 accordingly moves down with the holdingring and moves over the` top Aedge of the die ring |46 engaging -in `anannular .groove |66 cut in its outer upperl wall. By this time thelevers 99 of the holding fingers ing 39 and asthe holding ring continuesto descend the levers pivot on their pins |03. This draws the holdingfingers back and out of engagement with the ring c leaving it resting onthe die ring |46. upper part and also the tongue 21 project up above.the top of the die ring.

Continued descent of the punch parts first brings the face of the innerpressure ring |34 against the angular wall 15 of the cover 'part d.

with its raised central panel |09 extending inside of the pressure ring,and then both the cover part d and the draw ring |45 move down with4Immediately following and during the continued downward punch movements,the expanding ofthe central panel section |09 of .the cover part takesplace. By this time the knockout pad |4| has engaged the top of thecover panel and the downward pressure effective on the cover `91 engagethe annular shoulder 42 of the bush- In this position of the ring c anpart and draw ring-causes resumption of their descent and 'at the sametime the 'sectors |53 are depressed, the plate |59 moving down into a:recess |53 formed in the bolster plate 35.

This action causes theivertical and sloping cam-v surfaces of thesectors |53fto slide over the cor. responding .surfaces of the sationarycam plug |54. The sectors spread out as a result pressing theirprojections |63 into the vertical wall |06 of the cover. 'I'his verticalwall is accordingly transformed into a reversed curved and inwardly bentside wall |69 which provides a handle grip |1|',V as shown in Fig. 13.

The draw ring and its associated parts have nowV reached `the positionshown in Fig. 10, andthe cover part d has moved down to where its outerwall section 13 and a portion of its angular wall 15. are partiallywithin an annular recess |13 formed in the top of the, die ring |46. Inthis position the wall 13 engages the vertical wall `of the recess andisparallel with and yslightly lower than the ring c then resting in theoutside groove |33 of the die ring. The'flange- |08 of the cover partoverhangs the top of the dialing. 'I'he punch parts are not yet at theend of their descent.

During this time and while the panel section is being reformed as justdescribed the positions of the holding ring 44 and the outerv pressurering |23 have changed. V,This will first be considered before taking upthe final actions ofthe punch and die mechanisms.,

When the ring cwas deposited in the groove |56 of the die ring duringthe descent ofthe holding ring 44, the latter together with the pressurering |25 -of the descending punch continued their downward movement. Thesprings |23 backing up vthe outer pressure ring areweaker than the`springsl or 'rubber acting through the supporting vpins |22 which backup the .holding l. out pad then also raises while the die sectors |53-ring 44 and accordingly the springs |28 yield at this stage ci operationpermitting vthe punch plate |32 to catch up with the `pressure ring.

`This closes the gapbetween thetop of the pres-vA sure ring and thebottom of the plate.

After this is done the descending punchparts torce the holding ring 44down further into the die opening |2| bringing the parts into theposition shown in Fig. 10. In reaching this position the pressure ring|26 moves over the ring c resting on the die ring |46.

The inner lower corner of the pressure ring is cut back in an annulargroove |15 (Figs. 6 and 10) and the outer lower corner of the punchelement |25 is also cut away and an annular groove |18 is formedadjacent this corner. The grooves |15, |16 align when the pressure ring|26 seats against `theplate |32 and an inverted l .ishaped annularchannel |11 (Fig. 6) results.

Descent of the aligned punch partsll25.' |28 in coming into the positionof Fig. 10 causes the upstanding tongue 21 of the stationary supportring c to move around and bend over as it follows the curved upper wallof the channel |11. This is followed and accompanied by an inwardcurling o! the upper edge of the ring Vc which also starts moving aroundthe curved top wall of the U-shaped channel. By the time the parts havereached the. position of Fig. 10 tongue 21 has been bent into the shapeillustrated vin Fig. 13 and the upper edge of the ring has been inwardlyflanged as shown.

'I'he nal operation at station vC is completed I as the punch parts andcertain of the die parts move from the position illustrated in Fig. l()Ainto that shown ln Fig. '111, both the ring c and the cover part d atsuch time being further reformed,l

shaped and connected,

In this nnal descent of the punch and die parts anged edge are caused tofurther ow along the upper. walls of the descending channel |11 as thepunch parts |25, |25 move down over the ring.

This also fully seats that portion of the cover Darts within the diegroove |13 which heretofore partially entered the groove. This isfollowed by a bending of the cover flange |88 outwardly as it movesinside oi' the flange curl of the ring c.

At the bottom of the stroke the adjacent parts of ring c and cover partd are tightly compressed' between the upper edge of the die ring |46 andthe upper -wall of the channel |11. Thisrpro vides the nally formedsealing band e and container cover f which are temporarily united intothe resulting multipart closure g. This closure has an annular channel|8| formed by the curved cooperating walls of the parts e, f (Fig. 14).At the same time the tongue 21 is finally altered in shape so that itrests against the upper surface o f the cover part, as shown in Fig, 14,being completely contained within the closure.

0n the return stroke of the punch parts, the knockout pad |4| holds theclosure Vci in the position shown in Fig. 11 until the pressure ringsprings |25, |36 are fully expanded. The knockclosure g.

posed of.

are pushed up and off ofthe wedge and cam surfaces of the .stationarycam plug |54. The springs |56 thereupon contact the sections whichaction withdraws the projections |63 from' the handle grip |1|l of" thecover thus freeing the The formed closure clings to eter ofthe pressurering |34 and as the punch Vfurther lifts .the knockout pad is moveddown* relative to'the punch and strips orf the closure leaving. itin theholding ringabove the notched .sure 'a to a suitable ejecting stationwhere it is removed from the holding ring and discharged from theforming apparatus or otherwise dis- If a hermetic seal -is to beeffected when the the-inside diam#v closure is. applied-to a containerit is desirable.

that a sealing' compound be applied to the channel |8|. Accordingly itmay be subjected to a lining operation at a'stationD (Fig. 15). TheUeshaped channel |8| of the closure is passed under a spout or nozzle|83 of a suitable -compound lining machine or the like and. through-whichja sealing compound or other packing material .|84 may bedischarged into the channel. This will be suitably dried in the usualmanner.

The lined closure-g is now ready to be applied to the open top of acontainer 2|, one such container being illustrated in 1. The verticalwall section 13- of the closure is placed within the mouth of thecontainer in engagement with the container -wall 24, its curled edge 25entering into the'compound lined channel |8|. The parts are then readyfor the sealing operation.

Fig. 16 illustrates very briefly -the seeming ele..

ments of a sealing mechanism which may be considered to be located at aseeming station E. These elementsare a chuck |85 and a seeming" roller|86. The roller is formed with a groove |81 which engages the outervertical wall of the sealing band e and bends it around the outside ofthe container curl 25 with the lining |84 tightly engaged on the top oithe curl. 'This insures a tight closure for the container.

The tearing tongue 21 which is utilized in the removal of the sealingband e when the container is opened is on the inside of the closurecountersink and outl of the way of the closing roller during the sealingand is also lfully within the container or cover walls. This' makes thesealing a simple and ordinary operation which can be performed on anystandard closing machine equipmen't and provides a simple, easily openedclosure 'joint which will not be prematurely the sealing band.

It isthought that the invention and many of opened by inadvertentlystrikinglthe .tongue'of v its attendant advantages will be understoodfrom :spoilage or 'wastawhich comprises shaping the blank into 'a cupmember having two concentric walls, cutting between the said concentricwalls and dividing said cup member into an outer ring and an inner coverparti and reshaping said ring by drawing a portion thereof into asmallerdiameter to produce an annular sealing band; and securing said band tothe wall of said inner cover part to form a closure applicable as a unitto a container.

2.. The method of producing a multipart closure for containers from aone-.piece blank without spoilage or waste, which comprises shaping theblank into a cup member having two concentric walls, cutting between thesaid concentric walls and dividing said cup member into an outer ringand an inner cover part, reshaping said cover part to produce Va closurecover and to make it fit the container` to be closed, and reshaping saidring by drawing a portion thereof into a smaller diameter to produce anannular sealing band, and securing said band to the wall of said innercover part to form a closure applicable asa unit Vto a container.

walls and with a tearing tongue extending out from the wall having thelarger diameter, cutting between the said concentric walls and dividingsaid cup member into an outer ring containing said tearing tongue andaninner cover part, and reshaping said ring by drawing a portion thereofinto a smaller diameter at the saine time bending'in said tearing tongueto produce an annular sealing band, and securing said band to the wallof said inner cover part to form a closure applicable as a unit to acontainer.

4. The method of producing a multipart closure for containers from aone-piece blank without spoilage or waste, which comprises shaping theblank into a cup member having two concentric walls, cutting between thesaid concentric walls and dividing said cup member 'into an outer ringand an inner cover part, reshaping said ring by drawing a portionthereof into a smaller diameter to produce an annular sealing band, en-

gaging said sealing band and said cover part,

and reshaping both band and cover part into close fitting relationshipand securing them together to form.a unit closure separate fromand forthe container.

5. 'Ihe method of producing a multipart ,closure for'containers from aone-piece blank without spoilage or waste, which comprises shaping theblank into a cup member having two concentric walls, cutting between thesaid concentric walls and dividing said cup member into an outer ringand an inner cover part while simultaneously drawing the center of thelatter into al smaller diameter section, reshaping said ring by drawinga portion thereof .into'a smaller diameter to produce an annular sealingband, assembling said` sealing band and said cover part, and reshapingboth bandand cover part into close tting relationship, before themultipart closure is applied to a'can body, to form a unit closure forthe container and forming the sai-d cover drawn center v l 6. The methodof producing amultipart closureh for containers from a one-piece blankwithout spoilage or waste, which comprises shaping the blank into a cupmember having two concentric walls, cutting between the said concentricwalls and dividing said cup member into an outex` ring and an innercover part, reshaping said ring by drawing a portion thereof into avsmaller dlameter to produce an annular sealing band, engaging saidsealing band'a'nd said cover part, reshaping both band and cover partinto close fitting relationship, before the multipart closure is appliedto a can body, to form a unit closure for the container, and applying asealing compound in .the channel between said ring andcover parts.

7. The method of producing a multipart closure for containers from aone-piece blank without spoilage or waste and applying such closure tothe container to seal the latter, which comprises shaping the blank intoa cup member, dividing it into an outer ring and an inner cover part,reshaping said' ring into-an annular sealing band by drawing a portionthereof into a smaller diameter,v assembling band and cover parts,bending the two together while shaping them to ilt th`e container tobeclosed, before the multipart closure is applied to a can body, andsealing the container -by applying the assembled closure parts as a uniton an open end thereof and by curling said sealing band into tightengagement with said i container.

8. 4The method of producing a multipartclosure cover part, reshapingsaid ring'into an annular sealing band by drawing ar portion thereofintov a smaller diameter, assembling band and cover parta-bending thetwo together while shaping them to fit the container to be closed,before the multipart closure is applied to a can body, applying asealing compound to the parts so formed, and hermetically sealing thecontainer by applying the assembled closure parts as a unit to an openend thereof and by curling said sealing band into tight engagement withsaid container while confining said sealing compound in the joint soformed.

9. The method of producing a multipart closure for containers from aone-piece blank without spoilage or waste and applying such closure tothe container to seal the latter, which comprises shaping the blankiiito a cup 'member with a tearing tongue extending from its outer edge,dividing it into an outer ring which contains said tearing tongue andinto an 'inner cover part',.re shaping said ring into anlannular sealingband by drawing a portion thereof including said tearing tongue into asmaller diameter,- assembling band and cover parts,.bendin'g the twotogether while shaping them to fit the container to be closed, beforethe multipartlos'ure' is applied to a can body, and sealing thecontainer by ap'- plying the assembled closure parts as a unit'to anopen end thereof and by curling said sealing. band into tight engagementwith said contain'- er; said tearing tongue being then in condition foropening the container by severing said sealing band to free said cover.f

